CENERATION OF DATABASE FOR PREPARATION OF LANDSLIDE HAZARD ZONATION MAP OF THE WESTERN GHATS OF MAHARASHTRA, INDIA

Abstract

Methodology involving four steps for data base generation required for LHZ map of Western Ghats has been suggested. The first three steps viz. i) analysis of previous data, ii) laboratory investigations for preparation of base maps and iii) field checks offer valuable information on causative factors and their components of slope instability. This information, in turn, assisted in assigning the rating to each component or group of components in the fourth step. The rating scheme helped in obtaining the values of total hazard evaluation f actor , on the basis of which the study area has been categorized into four landslide capability zones namely, Most Hazardous-, Hazardous-, Moderately Hazardous-and Least Hazardous zones. The numerical data obtained in a representative area namely the Kera area has been presented and efficacy of the methodology is discussed. It has been suggested that the rating scheme can be useful in correlation of landslide affected areas of Western Ghats and the data base can be used in GIS/ILWIS.